Thermostatic circuit closer



June 1 6, 1925. 1,542,722

w. K. PINNELL TH ERMOSTATIC CIRCUIT CLOSER Filed May 25, 1.922 3 sheets sheet 1 WZZL'amKPL'nneZZ My INVENTOR WITNS: AITORNEY W. K. PINNELL THERMOSTATIC CIRCUIT CLOSER June 16, 1925.

il y 25, 1922 3 Sheets-Sheet 2 2 William, K. Flinn/ell a2 INVENTOR @1000 l l v BY 0 WITNESS:

ATTORNEY June 16, 1925. 7 1,542,722

W. K. PIN NELL THERMOSTATIC CIRCUIT CLOSER Filed May 25, 1922 5 Sheets-Sheet 5 IIIIIIIIIIIIIIlIlII/IIII/IIII/III/I- LLLlJIl/IIIIIIIfIlI/l ['IIII/IIIIII I I III mZZia/m K PinneZZ INVENTOR w ITNESS ATTORNEY Patented June 16, 19 25. v

7 1,542,722 UNITED STATES PATENT OFFICE.

WILLIAM K. PINNELL, OF SEDALIA, COLORADO.

THEBMOSTATIO CIRCUIT CLOSER. I

Application filed May 25, 1922. Serial No, 568,547;

To all whom it may concern:

Be it known that I, WILLIAM K. PINNELL, citizen of the United States, residin at Sedalia, in the county of Douglas and tate of Colorado, have invented new and useful Improvements in Thermostatic Circuit Closers, of which the following is a specification.

This invention relates to an electrically operated alarm for brooders, and the object is to rovide, in connection with suitable mounting means, a thermostatic wafer, and particular means for completing a circuit and sounding an alarm when the temperature rises above a specified point, or falls below that point.

A further object is to provide a stem for mounting the wafer referred to, the stemhaving one end thereof connected with the circuit, the opposite end cooperating with a sprin held and adjustable contact when the wa erexpands, and said stem carrying an element for engagement with an additional spring held contact member, when or rod '15 to -'comeJinto' engagement with the-'contactelement i16carried by the flat spring 17. This jsprging is mounted in a metallicblock' 18 carrying a binding post 19 and including an arm 20 through. which an adjusting screw 21, passes. This screw is designed-to control the space between the end of rod 15 and contact element 16. The upper end of the rod is guided by metallic plate 23 mounted on the dry'wood insula-' tion of the frame.

The stem 15 comprises aportion of an electric circuit and the separate lower end 15 extends through plate 24, and a binding screw 25 provides means for connection with wire 26 leading to battery 27, bell 28 and bindin 0st 19. The circuit is completed throu $racket or block 18, spring 17, contact e ement 16, thence to", stem 15. This circuit is energized upon the expansion of water 14., due to excessive heat. The complete circuit Ina be traced as follows: vbattery 27, wire 27 ,bell 28 binding post 19, bracket 18, spring 17 contact 16, upper the wafer contracts, due to a drop in term stem 15, includin portions 42, 43, wafer perature below the point determined upon 14, lower stem 15 elements 25, 26, to batefore setting an adjustable device assoter 27. c

ciated with the additional contact element. X contact element 30 cooperates with con- With the foregoing and other objects and tact element 31 mounted on the spring 32 advantages in view the invention consistssecured to bracket 33. This bracket carin the novel construction and arrangement ries an adjusting screw 34 for controlling of elements described and claimed, it bethe position of the s ring and contact 31, ing understood that modifications may be and also carries a bin ing 0st 35 connected made within the scope of the claim without with wire 36 leading to binding post 19. de arting from the s irit of the invention. If the temperature falls below the point l n the drawings, igure 1 shows the 0perative elements of the device and the mounting means, the view being chiefl in elevation, with parts in vertical section; igure 2 is a view in elevation showing a vertical stem for the wafer, slotted for an element designed to prevent rotation of the stem; Figure 3 is a view in vertical section and elevation, of the contact mechanism and wafer; Figure 4 is a similar view of another form; Fi re 5 is a top plan view of the contact mec anism of Figure 3, the upper housing beingin horizontal section.

In carrying out my invention, I provide suitable mounting means, such as a frame 10 formed of dry wood, and preferably of hard wood. The elements of the'frame may be connected by bolts or screws-11, the heads and nuts being countersunk.

A thermostatic wafer is designated 14 and the expansion thereof causes the stem ments 30, 31, lower stem 15', post 25, wire 26, battery 27, wire 27, bell 28, wire 29, post 19, wire 36, post 3 bracket 33, spring 32, and the contact elements specified. The circuits are normally open, the adjusting screws 34 and 21 being set at t e points required to retain the alarm inactive so long as the thermostatic wafer 14 neither expands nor contracts beyond the prescribed limits.

A transverse brace is designated 38, and a coiled spring 39 surrounds the stem, 1n the manner shown. The spring bears against plate 40 and against washer 41, the latter being carried upon the upper end of square portion 42 o the stem which is non-rotatable with reference to element 38, but slides therethrough, and carries contact element 30. The lower end 43 is secured to wafer 14, so that the contraction or. the

desired, a circuit is completed through ele- Wafer allows spring 39 to expand, and

the contact element 30 to move downwardly into enga enient with contact 31.

A socket member 14 on the lower side of the Waiter loosely engages the upper rounded end of stem 15, this socket member or seet having a concave recess, and electrical connection being made by the pressure of spring 3% In the form the device shown in Figure 2, rounded stem 1-5 is slotted longitudinally, or Vertically and a transverse bar or element 426 extends through the slotand prevents rotation of the stern maintaining the contact elements in alineinent.

In the form shown in Figure 8, square stern '57 passes through square opening in plate 4'? on the frame or housing 18 latter being of any suitable material or conn r 1, J i M u a structicn. 'lne upper onset end 00 oi iln stem. cooperates with the upper ecjusteble resilient contact element 51 mounted or: block 52 (of metal). or Wit i. lower resilient KL ting nu: 5c on screw 0:

'1 I i .Y =ent oi the iilUCl in an upihe base .c l .t

k by screw 59. orm illustre i1 Figr ed br'h therewith and mounting resilient contact elements 62, 63 controlled by adjusting screws 64, 65 The offset end 66 of square stem 67 cooperates with these contacts as before described. In the several forms, the wafer, of any standard type, is designed to be included in the circuit, details usually being omitted in the disclosure of the modifictitious, if referred to in connection with the first form.

W hat I claim is:

In a device of the class described a then rnostatic element, a stem. controlled thereby and including a device extending laterally from tl e stein, a plurality of contact members between which said device is movable:- upon the expansion or contraction of the the rnostetic device a vertically movable element for mounting the contact members, -ding" devices for said Vertically moving element, one 01'? said devices last named being threaded and all of these guiding devices passing loosely through the vertically' movable element resilient means for imparting thrust to said element, and an ad- 'ustable device enva 'in' the threaded M J b gt ng oevice for limiting the extent of me nient of the vertically movable element under resilient action and varyiii the. dis trance between one of contactelements and the device on the stem, or. .h vertically more-lilo element for independy the other contest element, let' a circuit through cont-act elements tliereofl 'wii LIAill EL Pllfl'il'l liliii. 

